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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7e599a7ab1a8df0fee205837489820b77e45b877c50e78578646556d4ac7e17' 
  AND token = 'vtnsSuldOlJaFIcde9QXcKhOSoE+AEQV0vl2HLsD2Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}